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note: delays in dumpi are now in nanoseconds rather than seconds

Add code sent to me from Babak @ UIUC for generating events from
their I/O trace recorder.

Pull all darshan workload generator logic into the workload generator
API. Nondeterminism (i.e. using rand()) still needs to be removed from
generating collective I/O events, since they will now be generated in
a collective manner -- not independently as before. Also, still need
to sort out collective timing issues.

Now, specify the darshan install directory with --with-darshan=/dir/
to build the darshan workload generator and link it with test
applications.

Modifications to autotools to include necessary info for building
the darshan workload API. This API compiles fine, but the mpi replay
test is not linking properly with darshan library.

suggested solution courtesy of Dries

- simplified configure.ac
- moved code from src/common to src directory
- misc minor fixes